CN103912421A - Dual Fuel Common Rail System And Diesel Only Method Of Operating Same - Google Patents
Dual Fuel Common Rail System And Diesel Only Method Of Operating Same Download PDFInfo
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- CN103912421A CN103912421A CN201410000992.8A CN201410000992A CN103912421A CN 103912421 A CN103912421 A CN 103912421A CN 201410000992 A CN201410000992 A CN 201410000992A CN 103912421 A CN103912421 A CN 103912421A
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- Prior art keywords
- fuel
- common rail
- liquid
- gaseous fuel
- pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/10—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A dual fuel common rail system may be operated in a regular mode in which a relatively large charge of gaseous fuel is ignited by compression igniting a relatively small injection quantity of liquid diesel fuel. The dual fuel system may be operated in a single fuel limp home mode in which liquid diesel fuel is injected at higher pressures. Over pressurization of the gaseous fuel side of the fuel system due to leaked liquid fuel is avoided by regularly injecting leaked liquid fuel, but not gaseous fuel, from the gaseous nozzle outlet set during the limp home mode of operation.
Description
Technical field
Relate generally to double fuel common rail system of the present invention, relates more specifically to comprise the tactful only diesel oil operation method of the liquid fuel in the gaseous fuel side of processing the system that leaks into.
Background technique
Known a kind of relatively novel motor tries hard to utilize two kinds of different fuel to obtain the efficiency being associated with compression-ignition also in conjunction with the advantage being associated with gas-firing fuel.Particularly, the duel fuel engine of a type adopts in each cylinder the liquid diesel fuel ignition by compression of a small amount of pre-spray, and then lights more substantial gas fuel.In a strategy of such motor, two kinds of fuel are directly sprayed from the single fuel injector being associated with each cylinder.For example, U. S. Patent 7,627,416 have instructed a kind of double fuel common rail system, and wherein liquid diesel and gas fuel both spray from the single fuel injector being associated with each cylinder.This reference recognizes, situation about likely existing is, when supply with due to gas fuel use up or system in rock gas part may have fault time, this motor need to only be used liquid diesel operating fuel.But this reference had not both been recognized and some problem of some challenge so that only diesel fuel supply model operation motor is associated, had not been instructed solution yet.
The present invention is intended to solve one or more problem presented above.
Summary of the invention
A kind of method of moving duel fuel engine comprises with normal mode and contingency mode operation bifuel system.In the time moving with contingency mode, when moving with normal mode compared with, more liquid fuel leaks in the gaseous fuel part of bifuel system.When with normal mode operation bifuel system, liquid fuel is ejected in cylinder and gaseous fuel is ejected in cylinder from second nozzle outlet group from the first jet expansion group.When with contingency mode operation bifuel system, liquid fuel is ejected in cylinder but gaseous fuel is not ejected in cylinder from second nozzle outlet group from the first jet expansion group.
On the other hand, a kind of double fuel common rail system comprises gaseous fuel rail and liquid fuel rail altogether altogether.Each fluid in multiple fuel injectors is connected to the common rail of gaseous fuel and liquid fuel is total to the each of rail.Liquid fuel supply and control pressurer system/device fluid are connected to described liquid fuel rail altogether.Gaseous fuel is supplied with and control pressurer system/device fluid is connected to described gaseous fuel rail altogether.Electronic controller and multiple fuel injectors, liquid fuel supply and control pressurer system are supplied with gaseous fuel and control pressurer system is controlled and communicated by letter.Electronic controller comprises that being arranged to transmit liquid sprays control signal to spray control signal with the emergent algorithm/emergency operating algorithm from second nozzle outlet group injecting LPG in liquefied condition from the first jet expansion group injecting LPG in liquefied condition and transmission gas.Electronic controller also comprises that being arranged to transmit liquid sprays control signal to spray control signal with the conventional algorithm/conventional operation algorithm from second nozzle outlet group gas jet fuel from the first jet expansion group injecting LPG in liquefied condition and transmission gas.
Accompanying drawing explanation
Fig. 1 is the schematic diagram according to duel fuel engine of the present invention;
Fig. 2 is the perspective view for a part for the motor of Fig. 1 motor and double fuel common rail system;
Fig. 3 is the sectional perspective view of a part for the motor body shown in Fig. 2, for disclosing the structure of a fuel injector and cylinder;
Fig. 4 is the sectional side view through coaxial tubular axis (quill) assembly according to a further aspect in the invention;
Fig. 5 is the sectional front view of fuel injector according to an aspect of the present invention; With
Fig. 6 is the logical flow chart that the method for the motor of service chart 1 is shown.
Embodiment
First referring to Fig. 1-3, duel fuel engine 10 comprises the double fuel common rail system 20 that is mounted to motor body 11, and described motor body 11 is limited with multiple cylinders 12.Double fuel common rail system 20 comprises each firm what a fuel injector 25 being positioned to for being directly injected to described multiple cylinder 12.The common rail 21 of gaseous fuel and liquid fuel altogether rail 22 fluids are connected to each fuel injector 25.Double fuel common rail system 20 also comprises gas supply and pressure control device 16 and liquid supply and pressure control device 17.Each fuel injector 25, gas pressure are supplied with and control gear 16 and liquid supply and pressure control device 17 are controlled and communicated by letter and by its control with electronic engine control device 15 in a known way.Gas is supplied with and pressure control device 16 can comprise the low-temperature liquefaction natural gas tank 40 of a pressurization, and it has fluid and be connected to the outlet of the cryopump 41 of variable output.Device 16 also can comprise heat exchanger 42, accumulator 44, pneumatic filter 43 and fuel adjusting module 45, and this module is for controlling gaseous fuel to gaseous fuel supply and the pressure of rail 21 altogether.Liquid supply and pressure control device 17 can comprise diesel tank 50, fuel filter 51 and electronically controlled high pressure fuel pump 52, and it is total to rail 22 feed fluid fuel and controls its pressure to liquid fuel.
Again referring to Fig. 4, double fuel common rail system 20 can comprise with the common conical seat 27 of each fuel injector 25 and seals the coaxitron shaft assembly 30 with interior tubular axis 32 and outer axial tube 33 contacting.The block 31 of coaxitron shaft assembly 30 can link together to limit respectively gaseous fuel rail 21 and liquid fuel rail 22 altogether altogether with gaseous fuel part of path 18 and liquid fuel part of path 19 chain types.Last coaxitron shaft assembly 30 that chain type connects has one group of plug in tractor tool position shown in figure 2.Each and the gaseous fuel that coaxitron shaft assembly 30 fluids are positioned multiple fuel injectors 25 is altogether between rail 21 and the common rail 22 of liquid fuel each.
Each coaxitron shaft assembly 30 can comprise the load control clamp 34 with pivot surface 75 contacting in load control position 56 with block 31, and described load control position 56 is intersected and formed by the axis 29 of interior tubular axis 32.Load control clamp 34 can limit the fastening piece slot 77 and the fastener hole 76 that receive respectively the first fastening piece 81 and the second fastening piece 80.Load control clamp 34 is in response to the pivotable on load control position 56 that is adjusted in to described the first and second fixed blocks 81,80.Fastening piece 80 and 81 is received in respectively in the fastener hole 54 and fastening piece slot 55 of block 31.
Each block 31 of each coaxitron shaft assembly 30 is limited with gaseous fuel portion's section that the axis 29 perpendicular to interior tubular axis 32 of rail 21 is orientated altogether.Gaseous fuel path 60 at one end leads to gaseous fuel and is total in rail 21 and within the other end leads to the first fuel inlet 101 of fuel injector 25.Portion's section of gaseous fuel path 60 is positioned between tubular axis 32 and outer axial tube 33.Each block 31 is also limited with liquid fuel portion's section of rail 22 altogether.Liquid fuel path 61 at one end leads to liquid fuel and is total in rail 22 and within its opposite end is led to the second fuel inlet 102 of fuel injector 25.
Often be released into the metal fragment in fuel flow in order to catch in the running for the first time of motor 10 after manufactured completing, coaxitron shaft assembly 30 can comprise gaseous fuel streamline formula filter 36 and liquid fuel edge filter 37.In the embodiment shown, liquid fuel edge filter 37 can be arranged in interior tubular axis 32.Gaseous fuel streamline formula filter 36 is shown as and is arranged in outer axial tube 33.It will be understood by those skilled in the art that edge filter 36 and 37 can be arranged at other positions, or omit, and do not depart from the scope of the present invention.
Referring to Fig. 5, fuel injector 25 according to the present invention comprises the injector body 100 that is limited with the first jet expansion group 103, second nozzle outlet group 104 and exhaust outlet 105 again.Injector body 100 is also limited with the first fuel inlet 101 and the second fuel inlet 102, visible in its sectional view of cutting open at the shared conical seat 27 through fuel injector 25 of Fig. 4.In injector body 100, be provided with the first control chamber 106 and second and control chamber 107.What the first one-way valve element 110 had the hydrodynamic pressure that is exposed in the first control chamber 106 closes hydraulic pressure surface 112.The first one-way valve element 110 can shown in move between closed position and open position, it contacts with First 108 in described closed position so that the first fuel inlet 101 and the first jet expansion group 103 fluids are blocked, and does not contact with First 108 at described open position so that the first fuel inlet 101 is communicated with sightless via fluid in the sectional view of the first jet expansion group 103 via Fig. 5.The second one-way valve element 120 have be exposed to the second control chamber 107 hydrodynamic pressure close hydraulic pressure surface 121.The second one-way valve element 120 can shown in move between operating position and open position, it contacts with the second valve seat 113 in described operating position so that the second fuel inlet 102 is organized 104 fluid blocking-up with second nozzle outlet, does not contact so that the second fuel inlet 102 is communicated with sightless via fluid in the sectional view of second nozzle outlet group 104 via Fig. 5 at described open position with the second valve seat 113.Like this, the first fuel (for example rock gas) is auxiliary by the movement of the first one-way valve element 110 through the injection of the first jet expansion group, and the second fuel (for example liquid diesel) is auxiliary by the motion of the second one-way valve element 120 through the injection of second nozzle outlet group 104.It will be understood to those of skill in the art that and can expect that the first and second jet expansion groups 103,104 are arranged to six jet expansions around center line separately in mode well known in the art each comprising.But the each of jet expansion group 103 and 104 includes as few as a jet expansion or any amount of jet expansion with any layout, and do not depart from the present invention.
The first control valve element 130 is arranged in injector body 100 and can moves along the common center line 125 between primary importance and the second place, described primary importance contacts with plane seat 151, first controls chamber 106 is blocked by fluid at this place with exhaust outlet 105, and first controls chamber 106 is connected via control access 133 fluids in the described second place with exhaust outlet 105.In the time that the first control chamber 106 fluids are connected to exhaust outlet 105, first controls the pressure drop in chamber 106, removes and for example puts on the pressure of closing on hydraulic pressure surface 112, to allow the first one-way valve element 110 to lift to assist the first fuel (rock gas) to spray through the first jet expansion group 103.The second control valve element 135 is arranged in injector body 100 and can moves along the common center line 125 between primary importance and the second place, contact with plane seat 156 in described primary importance, second controls chamber 107 is blocked by fluid at this place with exhaust outlet 105, and second controls chamber 107 is connected at described second place fluid with exhaust outlet 105.In the time that the second control chamber 107 fluids are connected to exhaust outlet 105, act on the hydrodynamic pressure of closing hydraulic pressure surface 121 and be released to allow the second one-way valve element 120 to be for example raised up to open position, to assist the second fuel (liquid diesel) to spray through second nozzle outlet group 104.
In the embodiment shown, the second control valve element 135 is crossing with common center line 125, but that the first control valve element 130 is limited with through its hole 131 and this hole 131 is concentric with common center line 125.Shown in fuel injector 25 in, corresponding control valve element 130,135 can be moved to respectively one of first and second positions separately by the first and second electric actuators 111,122.Control valve element 130,135 can be biased to one of their primary importances separately and second place by spring 146,147.Particularly, the first armature 141 can be attached to the driving member 145 contacting with the first control valve element 130.The first armature 141, driving member 145 and the first control valve element 130 can by bias spring 146 be biased to contact with plane seat 151 shown in position.Control valve element 130 can be by the action of self-aligned features 136 around rotating slightly perpendicular to the axis of common centerline 125, and when it allows each control valve element 130 contact plane seat 151, convex surface 137 moves on spill bearing surface 138.Like this, the first armature 141 can be counted as operationally to connect with mobile the first control valve element 130, the second armature 142 and is operationally connected into by multiple driving members 143 and move the second control valve element 135.Common stator 144 separates the first armature 141 from the second armature 142.
The first control valve element 130 contacts and throws off in the second place in primary importance respectively with plane seat 151.Similarly, the second control valve element 135 contacts and throws off in the second place in primary importance respectively with plane seat 156.Any or two of seat 151 and 156 can be conical seats.The first control valve element 130 can be connected into together with the first armature 141 and move in response to being arranged on the lower coil power-off in shared stator 144.In the time being arranged on the lower coil energising sharing in stator 144, armature 141 and driving member 145 upwards promote, and allow pushed at high pressure the first control valve element 130 in control access 133 to contact so that control chamber 106 fluids and be connected to exhaust outlet 105 with flat seat 151 disengagements.The first control chamber 106 and second is controlled chamber 107 always can be communicated to the second fuel inlet 102 via sightless via fluid in the sectional view of Fig. 5.Like this, the liquid diesel that is derived from the second fuel inlet 102 can be used as the operation controlling fluid and then control the first one-way valve element 110 with auxiliary gas fuel injection event and control the second element 120 with auxiliary liquid fuel injection event.
For suppressing fuel gas, upwards to enter from gas nozzle chamber 115 migration of controlling chamber 106 be useful to the annular hydraulic lock Sealing 132 that a kind of always fluid is connected to the second fuel inlet 102.Gas nozzle chamber 115 is always connected to the first fuel inlet 101 via sightless via fluid in Fig. 5.Specifically, referring to Figure 4 and 5, the present invention has instructed a kind of strategy to be total to rail 21 from fuel injector 25 separately to gaseous fuel under certain condition with inhibition liquid fuel and has shifted.In the time that double fuel common rail system 20 moves with normal mode, the common rail 22 of liquid fuel can maintain mesohigh (for example, can be 40MPa), and the common rail 21 of gaseous fuel can maintain mesolow (for example, can be 35MPa).This slight pressure difference is leak in the liquid fuel part of fuel injector 25 in order to suppress gaseous fuel and and then leak in whole double fuel common rail fuel system 20.Adding hydraulic lock Sealing 132 is that another feature moves in the liquid fuel side of double fuel common rail system 20 to suppress gaseous fuel.But expectedly, during conventional operation pattern, a certain amount of liquid fuel can leak to the gaseous fuel side of system, suitable the lubricating of moving element but this small amount of leakage can be encouraged.For example, a small amount of liquid diesel fuel can leak to downwards in gas nozzle chamber 115 from hydraulic lock sealing 132 in conventional operation pattern.Can expect that this small amount of liquid diesel sprays from jet expansion group 103 with each gas injection action.This small amount of liquid diesel of leaking can be for helping the guide movement of lubricated the first one-way valve element 110 and seat 108 in conventional operation pattern.
Double fuel common rail fuel system also can have single operating fuel pattern, wherein only has liquid diesel fuel to be used to motor 10 that power is provided.This operating mode can be known as contingency mode/emergency operating pattern, because preferred this pattern in the time breaking down in gas fuel system only.According to the present invention, fault can comprise that one or more gas supplies with in the inefficacy of pressure control devices 16, double fuel common rail fuel system 20 that other parts lost efficacy or can be to lack enough gaseous fuels under normal mode, to move continuing simply.In the time moving with contingency mode, electronic controller 15 can make liquid fuel altogether rail 22 maintain high pressure (for example, can be 80MPa), and gaseous fuel altogether the pressure in rail 21 can allow decay, and can be down to lentamente and be low to moderate atmospheric pressure.In contingency mode, motor 10 is as traditional diesel engine operation, and wherein liquid diesel fuel sprays enough amounts with compressing ignition through jet expansion group 104 on certain opportunity.On the other hand, in conventional operation pattern, can expect that relatively a small amount of pre-spray liquid diesel sprays with compressing ignition through jet expansion group 104, and then light the more substantial gaseous fuel spraying through jet expansion group 103 and provide power with the motor 10 to conventional operation.Owing to there being higher pressure difference between contingency mode run duration liquid fuel and gaseous fuel, can expecting the liquid fuel of the gas side that leaks into double fuel common rail system 20 than there being the liquid fuel leaking during the conventional operation pattern of less pressure difference more between two kinds of fuel.Because seldom or almost do not have gaseous fuel to be utilized at contingency mode run duration, and because liquid fuel is larger to the leak-down rate in gaseous fuel side, the present invention has instructed and has introduced an one-way valve 66 or 67 to prevent that the liquid diesel of accumulation leakage in gas nozzle chamber 115 from finally arriving and entering gas and being total to rail 21.Specifically, referring to Fig. 4, in one embodiment, one-way valve 66 can be arranged in the path that extends to the gas nozzle chamber 115 of individual fuel injector body 100 from the first fuel inlet 101.On the other hand, Fig. 4 also shows alternative position, and wherein, one-way valve 67 can be positioned in gaseous fuel path 60, for example, in block 31.It will be appreciated by those skilled in the art that, the liquid fuel leaking in contingency mode run duration one-way valve 66 or 67 blocking-up is to the gaseous fuel transfer of rail 21 altogether, but in conventional operation pattern, is open and allows gaseous fuel to 115 free-flows of gas nozzle chamber.
Referring to Fig. 1, although dispensable, double fuel common rail system 20 also can comprise electronically controlled separating valve 46 again, and it is operationally arranged at gaseous fuel supply and pressure control device 16 and gaseous fuel altogether between rail 21.Separating valve 46 can mechanically be setovered to closed position, but can be in response to moving to open position from the control signal of electric control device 15.When double fuel common rail fuel system 20 is in the time moving with normal mode, electronic controller 15 can make separating valve 46 be maintained at open position.But, change/be transitioned in the action of emergency operating pattern in this system, electronic controller 15 can close separating valve 46 with gas is supplied with and pressure control device 16 with can enter any leakage in the gas side of double fuel common rail system 20 liquid diesel fuel fluid isolate.
The present invention recognizes, with contingency mode run duration, and the liquid diesel fuel of the leakage pressure in the gaseous fuel side of double fuel common rail system 20 that can tend to raise.For example, the gaseous fuel side of double fuel common rail system 20 can be designed for receiving conventional operation pressure (can be for example 35MPa), but during emergency operating mode operation, can not hold reliably and the liquid fuel higher fluid fuel pressure (can be for example 80MPa) that rail 22 is associated altogether.Gaseous fuel side for fear of double fuel common rail system 20 becomes overpressure at contingency mode run duration, and the present invention has instructed ejecting on a small quantity to cylinder 12 the leakage liquid fuel stage of accumulation in gas nozzle chamber 115.In the time moving with contingency mode, owing to having introduced one-way valve 66,67, the pressure in the downstream of one-way valve 66 or 67 can be total to the remaining pressure in rail 21 higher than gaseous fuel substantially.The pressure in the downstream from one-way valve 66,67 being associated from different fuel injectors in addition, can be different due to different leakage flow rates.Like this, the present invention instructed possible needs some test to determine the leakage flow rate that can expect and about the variance of the expectation of average leaked flow rate to determine potential worst case, until the downstream pressure of one-way valve 66,67 is accumulated.Then this information can be used for developing an open loop/open circuit (open loop) thereby is tactful in to discharge the pressure in the downstream of one-way valves 66,67 to organize 103 injecting LPG in liquefied condition from gas nozzle outlet by opening the first one-way valve element 110 in the time that cylinder condition is suitable.For example, the present invention also can seek to avoid a kind of injection strategy, this strategy to avoid possible cylinder gas to be absorbed in the gas nozzle chamber 115 of individual fuel injector.Like this, with contingency mode run duration for discharge gas nozzle chamber 115 liquid fuel pressure open loop injection action frequency and may be selected to opportunity and avoid gas to be absorbed and avoid overpressure, even under the worst case of the leakage flow rate in one or more fuel injectors 25.For example, thereby strategy can be simply in a brief injection action the each induction stroke in each cycle of engine start utilize spray leakage to the liquid diesel fuel in gas nozzle chamber 115 to guarantee that emitted dose is too little of to cause the backfire of each cylinder, but the frequency of spraying under even the worst leakage situation can be enough to avoid the accumulation of pressure and potential overpressure.In addition, this strategy also can guarantee that cylinder gas is not inhaled in one or more fuel injectors 25, because the leakage flow rate that cylinder pressure is very low and be associated with one or more fuel injectors 25 can be also relatively low, this causes having significant difference between the pressure of the different fuel injector 25 in the downstream of each one-way valve 76,77.
Another alternative strategy be omitted one-way valve 76,77 and depend on the pressure information that passes to electric control device 15 from pressure transducer 24 with monitoring pressure controllably and by detect gaseous fuel altogether the potential pressure of rail 21 raise to spray the liquid diesel fuel of accumulation, (Fig. 1) transmitting as pressure transducer 24.In other words, when separating valve 46 is in the time being closed with contingency mode run duration, what can expect is that the liquid diesel fuel leaking in the time that common rail 21 shifts the liquid of accumulation from corresponding fuel injector to gaseous fuel enters corresponding gas nozzle chamber 115 to increase lentamente the pressure the common rail 21 of gaseous fuel.The pressure being total in rail 21 when gaseous fuel (for example reaches certain threshold value, may be 35MPa) time, the pressure that different fuel sparger 25 can activated to utilize accumulation in suitable reality and endurance is from each gas nozzle chamber 115 to the interior promotion of cylinder 12 or spray the leakage liquid diesel oil of accumulation.Because jet pressure is known, and because cylinder is expected, opportunity and endurance of injection action of spraying from gas nozzle outlet group for the liquid diesel that makes to leak can be selected to for avoiding these two cylinder gas to be inhaled into corresponding fuel injector, and sprays and can significantly not increase the thermal release of indivedual cylinders to destroy and the amount of the control logic being associated with the fuel feed of contingency mode run duration generation.
The present invention recognizes again, and the liquid diesel leak-down rate being associated from different fuel injectors 25 may be greatly different, consequently relatively high uncertainty, make fuel injector 25 to leak and pressure accumulated be contribution maximum.Like this, one embodiment of the present of invention can comprise one-way valve 66,67 and separating valve 46 both.In addition, the present invention recognizes, it is relatively unreliable that possible pressure sensor 24 itself exists fault to make for the control strategy of the liquid diesel of spray leakage.Like this, one embodiment of the present of invention will comprise the open loop policy of the liquid diesel fuel for spraying the downstream that accumulates on each safety check 76,77, also can comprise or can not comprise such control strategy, its pressure being total in rail 21 in response to gaseous fuel causes the injection action through gas nozzle outlet group 103 in a controlled manner.
Electronic controller 15 according to the present invention can comprise that being arranged for transmission liquid sprays control signal to organize 104 injecting LPG in liquefied condition from fluid injector outlet and to transmit gas and spray control signal to organize the emergent algorithm of 103 injecting LPG in liquefied condition from gas nozzle outlet.In addition, can expect, electronic controller 15 comprises that being arranged for transmission liquid sprays control signal to organize 104 injecting LPG in liquefied condition from fluid injector outlet and to transmit gas and spray control signal to organize the conventional algorithm of 103 gas jet fuel from gas nozzle outlet.What also can expect is that emergent algorithm is arranged for the ratio between liquid common rail pressure and gas common rail pressure is maintained to higher level.In addition, conventional algorithm is arranged for the ratio between liquid common rail pressure and gas common rail pressure is maintained to reduced levels.Emergent algorithm can be arranged to or not be arranged to control in response to being passed to the gas common rail pressure of electronic controller 15 from pressure transducer 24 from gas nozzle outlet and organize at least one opportunity and endurance of 103 injecting LPG in liquefied condition.
In the embodiment shown, the first one-way valve element 110 and the second one-way valve element 120 are along being parallel to shared center line 125 but each line separately spaced away moves.But, it will be understood by those skilled in the art that this structure can be different.For example, two concentric one-way valve element also will fall within the scope of the present invention with common center line 125 is concentric.
Industrial applicibility
The present invention is widely applicable for and utilizes any motor of two common rails that fluidly separate to the single-fuel injector pilot fuel device transfer the fuel being associated with each cylinder.Without departing from the invention, different at least one that the content of each common rail can be in pressure, chemical characteristics and phase relationship.In the example shown, each common rail is can be by hold respectively pressurized natural gas and liquid diesel fuel under different pressure all different aspect all three.The present invention is also applicable to double fuel common rail system, and it has the ability that uses two kinds of fuel to move with normal mode, and the ability with contingency mode operation of only being supplied with by single fuel at motor.For example, contingency mode can be corresponding to due to can be with using liquid diesel fuel without gaseous fuel.The present invention is specially adapted to prevent the overpressure of the gaseous fuel side of double fuel common rail system in the time moving with contingency mode from the leakage of liquid fuel lateral gas fuel-side due to liquid fuel.
Referring to whole Fig. 1-5, the method for operation duel fuel engine 10 is first by being assembled to motor body 11 by double fuel common rail system 20 again.Gaseous fuel is total to rail 21 from gaseous fuel and is correspondingly supplied to the each of multiple fuel injectors 25 by coaxitron shaft assembly 30.Similarly, liquid fuel is total to rail 21 from liquid fuel and is correspondingly supplied to the each of multiple fuel injectors 25 by coaxitron shaft assembly 30.In the time moving with normal mode, gaseous fuel sprays into cylinder 12 in response to the gaseous fuel injection signal that is passed to fuel injector 25 from electronic engine control device 15 from each fuel injector 25.Liquid fuel from fuel injector 25 is directly ejected in cylinder 12 from identical fuel injector 25 in response to the liquid fuel injection signal from electronic engine control device 15.The method of operation duel fuel engine 10 comprises that preferably the most of the time is with normal mode operation bifuel system 20.Preferably, within a small amount of time, double fuel common rail system 20 will move with contingency mode, and this may be because gaseous fuel is supplied depleted or perhaps causes and switch to single fuel mode in some fault of gas fuel system.In any action, contingency mode, compared with normal mode, can expect that more liquid fuels leak in the gaseous fuel part of double fuel common rail system 20.In the time moving with normal mode, liquid fuel is ejected in cylinder 12 and gaseous fuel is ejected in cylinder 12 from gas nozzle outlet group 103 from fluid injector outlet group 104.When with contingency mode operation double fuel common rail system 20, liquid fuel sprays and enters in cylinder 12 from fluid injector outlet group 104, and liquid fuel rather than gaseous fuel spray and enter in cylinder 12 from gas nozzle outlet group 103.In the time moving with contingency mode, electronic controller 15 will be taken action so that the ratio of liquid common rail pressure and gas common rail pressure maintains higher level, but when with normal mode operation double fuel common rail system 10, maintains this ratio at reduced levels.In the time moving with contingency mode, the liquid fuel that effectively stops leakage is arrived gaseous fuel rail 21 altogether by safety check 76,77.If be equipped with separating valve 46, operation method can comprise isolates with the common rail 21 of gaseous fuel gaseous fuel supply and pressure control device 16 in contingency mode, rather than isolates in normal mode.According to preferably, liquid fuel opportunity of spraying from gas nozzle outlet group 103 of leaking and endurance can in response to described gaseous fuel altogether the pressure rail 21 at least one in opportunity and endurance controlled, for example control by the pressure that is communicated to electronic controller 15 from sensor 24.On the other hand, if the liquid fuel leaking is eliminated with open loop approach or sprays, organize opportunity of liquid fuel of 103 spray leakage and endurance from gas nozzle outlet and can not consider the described gaseous fuel pressure rail 21 and at least one in opportunity and endurance controlled altogether.
Specifically referring to Fig. 6, it illustrates according to fuel control algorithm 160 of the present invention example now.This logic starts from ellipse 163 and proceeds to square frame 164, and wherein electronic controller 15 will determine whether that double fuel common rail system 20 should be with normal mode or contingency mode operation.If while operation according to conventional algorithm 161, inquiry 165 can make logic advance to square frame 166, and wherein separating valve 46 will be opened.In square frame 167, electronic controller 15 will make liquid rail pressure be maintained at middle high level, for example 40MPa.In square frame 168, electronic controller 15 will make gas rail pressure low-level in maintaining, for example 35MPa.Depend on as factors such as engine speed and load and other considerations, electronic controller 15 will determine in square frame 169 that liquid sprays control signal.In square frame 170, electronic controller will determine that gas sprays control signal.For example, typical conventional operation pattern can be included in the top at individual cylinder 12 center or spray the liquid diesel fuel of a small amount of pre-spray around.This small amount of liquid diesel fuel compressing ignition immediately, then electronic controller arrives individual cylinder 12 by order gaseous fuel injection action to supply with more substantial gaseous fuel.The compressing ignition of a small amount of liquid diesel fuel of pre-spray will contribute to light much bigger gaseous fuel quantity.In inquiry 171, whether logic can inquiry there is gas system fault.For example, can mean simply that according to the fault of gas system of the present invention gaseous fuel supply exhausts.The fault of other gas fuel system includes but not limited to that one or more gas is supplied with and pressure control equipment 16 lost efficacy or some other fault known in the art.If there is not gas system fault, logic will be returned to square frame 167 and continue to move with normal mode according to conventional algorithm 161.On the other hand, if gas system fault detected, the logic square frame 164 of getting back to capable of circulation moves again to determine whether continuation with normal mode operation or to be transformed into contingency mode.
If the definite system of inquiry 165 will be moved with contingency mode, logic will advance to square frame 172 to start to carry out emergent algorithm 162.In square frame 172, separating valve 46 will be closed.Then, electronic controller 15 will make liquid rail pressure maintain higher level, for example, at the order of magnitude of 80MPa.In square frame 174, electronic controller 15 sprays control signal to provide necessary liquid diesel fuel according to the engine speed of special time and load demand as motor 10 by definite liquid.For example, in the time moving with contingency mode, can expect and spray with the much bigger liquid fuel of the generable injection of normal mode run duration than those.In square frame 175, the pressure that liquid is removed tactful common rail 21 that can not consider by spraying control signals to individual fuel injector 25 order gaseous fuels gaseous fuel from the open loop of the gas side of common rail fuel system 20 is realized.For example, when cylinder pressure is adapted at the upper liquid diesel fuel that sprays a small amount of leakage from individual fuel injector 25 in conventional basis when preventing any a large amount of accumulation the gas nozzle chamber 115 of liquid diesel at individual fuel injector 25, a small amount of injection can occur on conventional basis.In square frame 176, electronic controller can be from sensor 24 sensings or definite gas rail pressure.If when gas rail pressure exceedes certain threshold value, as may be 35MPa time, inquiry 177 can determine that the gas side of fuel system 20 becomes overpressure, if so, the liquid fuel leaking in square frame 178 can spray control signal to individual fuel injector 25 by transmitting gas from the controlled removing of the gas side of fuel system, realizes by liquid fuel rather than the gaseous fuel of organizing 103 spray leakage from gas nozzle outlet.If inquiry 177 is returned to negative information explanation gas rail and seemed there is no overpressure, logic can advance to inquiry 179 to determine whether the trouble or failure of gas rail pressure sensor 24.If logic can advance to oval 180 to finish.On the other hand, if a negative result is returned in inquiry, this logic can be circulated back to square frame 173 and continue and move with contingency mode according to emergent algorithm 162.
It should be understood that the only object for illustrating of description above, and be not intended to limit the scope of the invention by any way.Therefore, it will be understood by those skilled in the art that other side of the present invention can obtain from research accompanying drawing, summary of the invention and claims.
Claims (10)
1. a method of moving duel fuel engine, comprises the following steps:
With normal mode operation double fuel common rail system;
With contingency mode operation double fuel common rail system;
In the time moving with contingency mode, when moving with normal mode compared with, leak more liquid fuels to the gaseous fuel part of bifuel system;
When with normal mode operation double fuel common rail system, from the first jet expansion group injecting LPG in liquefied condition and from second nozzle outlet group gas jet fuel to cylinder;
When with contingency mode operation double fuel common rail system, from the first jet expansion group injecting LPG in liquefied condition and from second nozzle outlet group injecting LPG in liquefied condition rather than gaseous fuel to cylinder.
2. method according to claim 1, is characterized in that, comprises the following steps:
When with contingency mode operation bifuel system, the ratio of liquid fuel common rail pressure and gaseous fuel common rail pressure is maintained to high level;
When with normal mode operation bifuel system, the ratio of liquid fuel common rail pressure and gaseous fuel common rail pressure is maintained low-level; With
Blocking-up liquid fuel is total to the movement in rail to gaseous fuel.
3. method according to claim 2, is characterized in that, is included in contingency mode rather than in normal mode and makes gaseous fuel supply and pressure control device and gaseous fuel be total to rail isolation;
At least one opportunity and the endurance of spraying from second nozzle outlet in response to gaseous fuel pressure control of common rail system liquid fuel.
4. method according to claim 1, is characterized in that, comprises and controls at least one opportunity and the endurance that liquid fuel sprays from second nozzle outlet, and do not consider gaseous fuel common rail pressure.
5. a double fuel common rail system, comprising:
Gaseous fuel is rail altogether;
Liquid fuel is rail altogether;
Multiple fuel injectors, described in each, fuel injector fluid is connected to each in the common rail of described gaseous fuel and the common rail of described liquid fuel;
Fluid is connected to described liquid fuel liquid fuel supply and the pressure control device of rail altogether;
Fluid is connected to described gaseous fuel gaseous fuel supply and the pressure control device of rail altogether;
Electronic controller, this electronic controller and described multiple fuel injector, described liquid fuel supply and pressure control device, supply with described gaseous fuel and pressure control device is controlled and communicated by letter, this electronic controller comprises that being arranged for transmission liquid sprays control signal to spray control signal with the emergent algorithm from the second outlet group injecting LPG in liquefied condition from the first jet expansion group injecting LPG in liquefied condition and transmission gas, also comprise being arranged for and transmit liquid injection control signal to spray control signal with the conventional algorithm from the second outlet group gas jet fuel from the first jet expansion group injecting LPG in liquefied condition and transmission gas.
6. double fuel common rail system according to claim 5, is characterized in that, described emergent algorithm is arranged for the ratio between liquid common rail pressure and gas common rail pressure is maintained to high level;
Wherein said conventional algorithm is arranged for the ratio of liquid fuel common rail pressure and gaseous fuel common rail pressure is maintained low-level;
Described system also comprises that being operationally arranged for each from described multiple fuel injectors of blocking-up liquid fuel is total to gaseous fuel the one-way valve that rail moves.
7. double fuel common rail system according to claim 6, is characterized in that, comprises and is operationally arranged at described gaseous fuel supply and pressure control device and the described gaseous fuel electronically controlled separating valve between rail altogether.
8. double fuel common rail system according to claim 7, is characterized in that, comprises the gas rail pressure sensor of communicating by letter with described electronic controller; And
Wherein said contingency mode is arranged at least one opportunity and the endurance of spraying from described second nozzle outlet in response to gaseous fuel pressure control of common rail system liquid fuel.
9. double fuel common rail system according to claim 5, is characterized in that, comprises and is operationally arranged for each from described multiple fuel injectors of barrier liquid fuel to the gaseous fuel one-way valve that rail moves altogether.
10. double fuel common rail system according to claim 4, is characterized in that, comprises and can lead to each and the gaseous fuel that are fluidly arranged in described multiple fuel injector rail and the liquid fuel coaxitron shaft assembly between each in rail altogether altogether.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/732,673 US9228507B2 (en) | 2013-01-02 | 2013-01-02 | Dual fuel common rail system and diesel only method of operating same |
| US13/732,673 | 2013-01-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103912421A true CN103912421A (en) | 2014-07-09 |
| CN103912421B CN103912421B (en) | 2017-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410000992.8A Expired - Fee Related CN103912421B (en) | 2013-01-02 | 2014-01-02 | The method that dual fuel common rail system and only diesel oil run the system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US9228507B2 (en) |
| CN (1) | CN103912421B (en) |
| DE (1) | DE102013021921A1 (en) |
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| CN108699992A (en) * | 2016-02-02 | 2018-10-23 | 罗伯特·博世有限公司 | Method and fuel feed system for running fuel feed system |
| CN111550317A (en) * | 2019-02-11 | 2020-08-18 | 罗伯特·博世有限公司 | Method for operating a fuel system, control unit and fuel system |
| CN111765020A (en) * | 2020-07-08 | 2020-10-13 | 潍柴动力股份有限公司 | Gas rail pressure adjusting method and system |
| CN114165377A (en) * | 2021-12-17 | 2022-03-11 | 中国船舶重工集团公司第七一一研究所 | Common rail system and pressure limiting valve |
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| US10066612B2 (en) | 2015-07-01 | 2018-09-04 | Caterpillar Inc. | Method of operating cryogenic pump and cryogenic pump system |
| US10378495B2 (en) * | 2017-10-30 | 2019-08-13 | Caterpillar Inc. | Fuel system having purging capability for reduced fuel dribble |
| US10563609B2 (en) * | 2017-11-16 | 2020-02-18 | Caterpillar Inc. | Fuel injector |
| US11352965B2 (en) * | 2019-10-18 | 2022-06-07 | Caterpillar Inc. | Reverse flow detection system |
| CN113931763A (en) * | 2021-09-30 | 2022-01-14 | 东风商用车有限公司 | High-pressure common rail pipe |
| US20240301849A1 (en) * | 2023-03-08 | 2024-09-12 | Caterpillar Inc. | Containerized alternative fuel control unit |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102013021921A1 (en) | 2014-07-03 |
| US20140182552A1 (en) | 2014-07-03 |
| CN103912421B (en) | 2017-12-05 |
| US9228507B2 (en) | 2016-01-05 |
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